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Commentary

Nature 445, 257-258 (18 January 2007) | doi:10.1038/445257a

Merging and emerging cohorts: Not worth the wait

Walter C. Willett1, William J. Blot, Graham A. Colditz, Aaron R. Folsom, Brian E. Henderson & Meir J. Stampfer

  1. Walter C. Willett is in the Department of Nutrition, Harvard School of Public Health, Boston, Massachusetts 02115, USA. For additional information, e-mail Email: walter.willett@channing.harvard.edu.

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How best to study the effects of genes and environment on US health? In the first of two commentaries, Walter C. Willett and his co-authors argue that investing in existing studies is the most efficient approach.

In the second, Francis S. Collins and Teri A.